(cli): change-set diff not required for new stack diffs

[mrgrain]

Describe the bug

The change-set diff approach for new stacks is unnecessary. The whole point of change-set based diff was to fix incorrect resource replacements, however for a new stack we don't have resource replacements.

Further more, the clean-up code for change-set based diff on new stacks includes a delete-stack call. This is required to not leave behind an empty ghost stack. But it is quite spooky to see this code and a lot of delete-stack calls in CloudTrail.

Expected Behavior

Diff for new stacks does use the previous local diff implemenation.
CDK does not make any delete-stack calls when executing cdk diff.

Current Behavior

n/a

Reproduction Steps

• create a new stack
• run cdk diff
• check CloudTrail

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.130.0

Framework Version

No response

Node.js Version

any

OS

any

Language

TypeScript, Python, .NET, Java, Go

Language Version

No response

Other information

No response

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